74F640 Datasheet, PDF (2/11 Pages) NXP Semiconductors – Octal bus transceiver, inverting 3-State

Philips Semiconductors
Octal bus transceiver, inverting (3-State)
Product specification
74F640
FEATURES
• High-impedance NPN base inputs for reduced loading
(70µA in High and Low states)
• Ideal for applications which require high-output drive and minimal
bus loading
• Inverting version of 74F245
• Octal bidirectional bus interface
• 3-State outputs sink 64mA and source 15mA
DESCRIPTION
The 74F640 is an octal transceiver featuring inverting 3-State bus
compatible outputs in both transmit and receive directions. The B
port outputs are capable of sinking 64mA and sourcing 15mA,
providing very good capacitive drive characteristics. The device
features an Output Enable (OE) input for easy cascading and
Transmit/Receiver (T/R) input for direction control. The 3-State
outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
PIN CONFIGURATION
T/R ¹
A0 ²
A1 ³
A2 ⁴
A3 ⁵
A4 ⁶
A5 ⁷
A6 ⁸
A7 ⁹
GND ¹⁰
20 V_CC
19 _OE
18 _B0
17 _B1
16 _B2
15 _B3
14 _B4
13 _B5
12 _B6
11 _B7
SF00198
TYPE
74F640
TYPICAL
PROPAGATION
DELAY
3.5ns
TYPICAL SUPPLY CURRENT
(TOTAL)
78mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V_CC = 5V ±10%,
T_amb = 0°C to +70°C
20-pin plastic DIP
N74F640N
20-pin plastic SOL
N74F640D
PKG DWG #
SOT146-1
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
A0 - A7, B0 - B7
Data inputs
OE
Output Enable input (active Low)
T/R
Transmit/Receive input
A0 - A7
A port outputs
B0 - B7
B port outputs
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
74F(U.L.)
HIGH/LOW
3.5/0.115
2.0/0.067
2.0/0.067
150/40
750/106.7
LOAD VALUE
HIGH/LOW
70µA/70µA
40µA/40µA
40µA/40µA
3.0mA/24mA
15mA/64mA
1989 Nov 27
2
853–0381 98171